CVE-2021-20988

HIGH 7.5CVE-2021-20988 · Published 13/05/2021 · updated 17/06/2026

In short

CVE-2021-20988 is a HIGH (CVSS 7.5) vulnerability affecting rcx rtos (hilscher).
Chance of exploitation in the next 30 days (EPSS): 0.99%, higher than 62.7% of all vulnerabilities.
Fix: update to 2.1.14.1 or later.

Package	Affected versions	Patched versions
rcx rtos hilscher	`< 2.1.14.1`	`2.1.14.1`

Description

In Hilscher rcX RTOS versions prios to V2.1.14.1 the actual UDP packet length is not verified against the length indicated by the packet. This may lead to a denial of service of the affected device.

References

cert.vde.com/de-de/advisories/vde-2021-018 · Third Party Advisory
kb.hilscher.com/display/ISMS/2019-04-10+Wrong+handling+of+the+UDP+checksum · Vendor Advisory

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